Photographic-tray rocker



M. E. ANDERSON.

FHDTOGRAPHIC TRAY ROCKER.

APPLICATION FILED JULY 2,1920.

1,416,89@ Patented May 16, 1922.-

2 SHEETS-SHEET I.

wrrNEssEs y if@ E? M. E. ANDERSON.

'PHOTOGRAPHIC TRAY ROCKER.

APPLICATION FILED JULY 2,1920.

1,41 ,396 Patented May 16,1922.

2 SHEETS-SHEET 2.

INVENTOR man hilf

i E. ANDERSON, 0F CLARKSVILLE, ARKANSAS.

PHOTOGRAPHIC-TRAY ROCKER.

intense.

Application, filed July 2,

T 0 @ZZ whom t may concern Be it known that I7 Minn E. ANDERSON, a citizen of the United States, residing at Clarksville, in the county of Johnson and State of Arkansas, have invented new and useful Improvements in Photographic-Tray Rockers, of which the following is a specification.

This invention relates to devices intended for use by photographers and the like, and has for its object the provision of a motor driven means for rocking back and forth the tray in which photographic plates or films are developed whereby the developing solution will efficiently act upon the plates or films in the most thorough manner, it being well known that unless the developing tray is rocked, air bubbles form upon the sensitized surface of the plate or film and produce spots in the negatives.

An important Objectis the provision of a device of this character which will be a great labor and time saver inasmuch as the operator need not remain in the darkroom while the negatives are developing as the manual manipulation of the tray is rendered unnecessary.

An additional object is the provision of a device of this character which will be simple and inexpensive in manufacture, highly eflicient in use, durable in service, and a general improvement in the art.

With the above and other objects and advantages in View, the invention consists in the details of construction to be hereinafter more fully described and claimed, and illustrated in the accompanying drawings in which- Figure 1 is a side elevation of the device,

Figure 2 is an end view,

Figure 3 is a longitudinal sectional view showing the spring motor, and

Figure 4 is a plan view with the rocking tray removed.

Referring more particularly to the drawings, the numeral 10 designates the base of the device upon which is disposed and pivoted as shown at 11, a rocker member 12 carrying at its upper end a platform 13. The letter A designates a tray within the plates or films and developing solution are disposed and in the use of the device the tray is disposed upon theplatform 13.

Secured upon the base 10 is a supporting block 15 which carries a frame 16 within which is mounted a spring motor designated Specification of Letters Patent.

Patented May 16 19.22.

1920. Serial No. 393,614.

by the numeral 17 and having the usual spring 18, winding key 19, and gears 20. The numeral 21 designates the driven shaft of this sprino motor and this shaft carries an arm 22. tFivoted at 23 upon the frame is an arm 24 with which is pivotally connected a link 25 which is in turn pivotally connected with the free end of the arm 22. The free end of the arm 24 is provided with a roller 26 which is engaged within an inclined slot 27 formed in a metallic plate 28 which is suitably secured upon one corner portion of the platform 13 as shown.

In the use of the device it will be seen that when the spring motor is set in operation and the shaft 21 consequently rotated, the movement of the arm 22 carried by the shaft 21 will cause movement of the link 25 which is pivotally connected with the arm 24C and this will of course result in back and forth movement of the arm 24. Owing to the fact that the roller 26 carried by the free end of the arm 211 engages within the diagonal slot 27 in the plate 28 it will be readily apparent that the platform 13 and consequently the tray A supported thereon will be rocked in an efficient manner to cause the liquid within the tray to move back and forth over the plate, film photographic paper or other matter disposed within the tray for treatment.

From the foregoing description and a study of the drawings it will be apparent that I have thus provided a simply constructed and consequently inexpensive device which provides power means for rocking a photographic developing tray so as to cause the proper washing of the solution back and forth over the plates and films to prevent formation of air bubbles thereon.

While I have shown and described the preferred embodiment of my invention, it is of course to be understood that I reserve the right to make such changes in the form, construction, and arrangement of part-s as will not depart from the spirit of the invention or the scope of the subjoined claims.

Having thus described my invention, I claim:

1. Means for operating a rockable element, comprisinga depending plate carried by the rockable element and provided with an inclined slot, a horizontally swingable arm disposed within said slot, and means for swinging said arm back and forth whereby its engagement and movement within said dlriven elink and link connection for said arm whereby to effect swinging of the erm back and forth to impart movement to the l0 roelable element.

.ln testimony whereof l a'HiX my signature.

MKE E. ANDERSON. 

